The most reliable method for Citra users is the method, which acts like a "mod" folder for your game.
If you are downloading a randomizer repack, you are likely a hardcore player. Here is the optimal settings list for maximum difficulty (if you ever patch your own): pokemon y randomizer rom download citra repack
Assuming you have downloaded a file named something like Pokemon_Y_Randomizer_Repack_NoCrash.3ds , follow these steps. The most reliable method for Citra users is
Before downloading, you must understand what these terms mean. follow these steps. Before downloading
The latest Nightly or Canary build for the best performance.